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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc6a2e9adc163916701a624601e04b1ea24da67aacda1a65c62cc17d8c2fd09' 
  AND token = 'lwNCrH01+HLMgIu+rWwANc9ph3EpP9gBzewUSGEzG+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}